5 EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448,
6 EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448
7 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
11 The B<X25519>, B<X448>, B<ED25519> and B<ED448> keytypes are
12 implemented in OpenSSL's default and FIPS providers. These implementations
13 support the associated key, containing the public key I<pub> and the
16 In the FIPS provider they are non-approved algorithms and do not have the
17 "fips=yes" property set.
18 No additional parameters can be set during key generation.
21 =head2 Common X25519, X448, ED25519 and ED448 parameters
23 In addition to the common parameters that all keytypes should support (see
24 L<provider-keymgmt(7)/Common parameters>), the implementation of these keytypes
25 support the following.
29 =item "group" (B<OSSL_PKEY_PARAM_GROUP_NAME>) <UTF8 string>
31 This is only supported by X25519 and X448. The group name must be "x25519" or
32 "x448" respectively for those algorithms. This is only present for consistency
33 with other key exchange algorithms and is typically not needed.
35 =item "pub" (B<OSSL_PKEY_PARAM_PUB_KEY>) <octet string>
39 =item "priv" (B<OSSL_PKEY_PARAM_PRIV_KEY>) <octet string>
41 The private key value.
43 =item "encoded-pub-key" (B<OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY>) <octet string>
45 Used for getting and setting the encoding of a public key for the B<X25519> and
46 B<X448> key types. Public keys are expected be encoded in a format as defined by
51 =head2 ED25519 and ED448 parameters
55 =item "mandatory-digest" (B<OSSL_PKEY_PARAM_MANDATORY_DIGEST>) <utf8 string>
57 The empty string, signifying that no digest may be specified.
73 An B<EVP_PKEY> context can be obtained by calling:
76 EVP_PKEY_CTX_new_from_name(NULL, "X25519", NULL);
79 EVP_PKEY_CTX_new_from_name(NULL, "X448", NULL);
82 EVP_PKEY_CTX_new_from_name(NULL, "ED25519", NULL);
85 EVP_PKEY_CTX_new_from_name(NULL, "ED448", NULL);
87 An B<ED25519> key can be generated like this:
89 EVP_PKEY *pkey = NULL;
91 EVP_PKEY_CTX_new_from_name(NULL, "ED25519", NULL);
93 EVP_PKEY_keygen_init(pctx);
94 EVP_PKEY_gen(pctx, &pkey);
95 EVP_PKEY_CTX_free(pctx);
97 An B<X25519> key can be generated in a similar way:
99 EVP_PKEY *pkey = NULL;
101 EVP_PKEY_CTX_new_from_name(NULL, "X25519", NULL);
103 EVP_PKEY_keygen_init(pctx);
104 EVP_PKEY_gen(pctx, &pkey);
105 EVP_PKEY_CTX_free(pctx);
109 L<EVP_KEYMGMT(3)>, L<EVP_PKEY(3)>, L<provider-keymgmt(7)>,
110 L<EVP_KEYEXCH-X25519(7)>, L<EVP_KEYEXCH-X448(7)>,
111 L<EVP_SIGNATURE-ED25519(7)>, L<EVP_SIGNATURE-ED448(7)>
115 Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
117 Licensed under the Apache License 2.0 (the "License"). You may not use
118 this file except in compliance with the License. You can obtain a copy
119 in the file LICENSE in the source distribution or at
120 L<https://www.openssl.org/source/license.html>.